I was doing some HF mobile on 17 today and I noticed something I never really noticed before. Whenever I would cross over a bridge on the interstate there was a increase in ignition like static noise. Did it every time and always sounded the same. I am curious if anyone else has noticed it.

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--------------------------------------Ham since 1969.... Old School 20wpm REAL Extra Class..

Have you check the SWR on 17m lately? How high of the road surface (terra firma) is your feed point?Bear in mind, bridges has much more rebar plus Ibeam than the road surface.

((((73)))) Milverton.

Match is good. Feed point is about 30 inches above ground. I have not really listened on another band to see if it does it there. Mobile is only place I can do 17 so I tend to use that band mobile. Yes, the rebar and metal in bridge may indeed be a factor here.

Logged

--------------------------------------Ham since 1969.... Old School 20wpm REAL Extra Class..

Have you check the SWR on 17m lately? How high of the road surface (terra firma) is your feed point?Bear in mind, bridges has much more rebar plus Ibeam than the road surface.

((((73)))) Milverton.

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Match is good. Feed point is about 30 inches above ground. I have not really listened on another band to see if it does it there. Mobile is only place I can do 17 so I tend to use that band mobile. Yes, the rebar and metal in bridge may indeed be a factor here.

Assuming the Vehicle is adequately bonded. Is there any way to further increase the feed point above (Terra Firma) and beyond 30"

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